JPS6469880A - Failure detecting valve - Google Patents
Failure detecting valveInfo
- Publication number
- JPS6469880A JPS6469880A JP22679787A JP22679787A JPS6469880A JP S6469880 A JPS6469880 A JP S6469880A JP 22679787 A JP22679787 A JP 22679787A JP 22679787 A JP22679787 A JP 22679787A JP S6469880 A JPS6469880 A JP S6469880A
- Authority
- JP
- Japan
- Prior art keywords
- pressure chamber
- failure
- piston
- pressure
- main piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Indication Of The Valve Opening Or Closing Status (AREA)
Abstract
PURPOSE:To change over the valve in the caption automatically to a normal position in case of failure by transmitting the pressing force of a push rod to a valve member via pressure in a pressure chamber being formed of a main piston and an auxiliary piston. CONSTITUTION:A main piston 5 is hollowed and an auxiliary piston 9 is fitted into the hollow part thereof, the both pistons forming a pressure chamber 11. The pressure chamber 11 is connected to a pilot port 13 formed in a valve body 1 via a small hole 12 formed in the main piston 5. A push rod 15 which exerts a pressing force in accordance with the exciting current of an electromagnetic drive part 14 is allowed to contact with the auxiliary piston 9. In the case of an electric system failure, the electromagnetic drive part 14 is not excited and a spool 4 therefore is not changed over. Also the failure of a hydraulic system will not allow the spool 4 to move, since pressure is not produced in the pressure chamber 11.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22679787A JPS6469880A (en) | 1987-09-10 | 1987-09-10 | Failure detecting valve |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP22679787A JPS6469880A (en) | 1987-09-10 | 1987-09-10 | Failure detecting valve |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6469880A true JPS6469880A (en) | 1989-03-15 |
Family
ID=16850766
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP22679787A Pending JPS6469880A (en) | 1987-09-10 | 1987-09-10 | Failure detecting valve |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6469880A (en) |
-
1987
- 1987-09-10 JP JP22679787A patent/JPS6469880A/en active Pending
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